First of all I'm not a student nor a engineer.

Pretend I'm lost in the desert with just a car with a broken engine. The battery of my phone is over.

Is there any chance I can survive (charging the phone a little bit to call for help) or I am a dead man?

If so, how?

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    \$\begingroup\$ When you go to the desert, you get yourself a car charger for your phone... \$\endgroup\$ – Cornelius Nov 30 '14 at 14:28
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    \$\begingroup\$ There is a proposal on Area 51 you may be interested in: MacGyvering \$\endgroup\$ – PeterJ Nov 30 '14 at 14:38
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    \$\begingroup\$ While it's so obvious that it's not worth saying because people 'just don't want to listen', this is NOT a question about "... the use of electronic devices ..." and it IS a question re electronic (or electrical) design. IF people don't want questions like this here, or do not wish newcomers to feel welcome, or don't want people from Italy (unlikely) or whatever, they should either say so explicitly so a new user gets some decent guidance and a feeling that they are at least a little welcome (IF in fact they are). As it it this type of response is inept, impolite and unproductive .... \$\endgroup\$ – Russell McMahon Nov 30 '14 at 22:57
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    \$\begingroup\$ ...., unless 'setting a high bar' is part of what is desired. | Spehro's excellent Borneo ex-head-hunter anecdote is a superb example of what Giorgio was asking about and of what people can do and should be able to do in emergencies. I have cobbled together chargers in Chinese hotel rooms when the original was 8000 km away (no ex head hunters in view), got people's car started by substituting a coil of available wire for a blown ignition ballast resistor and lots of other fun things. Making a USB charger starting with a dead car IS something that Spehro could do. If that's not suited .... \$\endgroup\$ – Russell McMahon Nov 30 '14 at 23:02
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    \$\begingroup\$ .... to this site we should SAY so - not just kick people down the stairs (yet again) as is our wont. \$\endgroup\$ – Russell McMahon Nov 30 '14 at 23:03

In my car I have a splitter with a couple car outlets and a couple 2A USB outlets, as well as a tiny 120V inverter. The power for those devices, to run phones, tablets, notebook computers (I would normally have 3-4 such devices in the car) comes from the car battery when the engine is not running.

There is plenty of energy in a healthy fully-charged car battery (or a laptop battery) to charge a cell phone, it's a matter of having the correct gadgets around to convert the voltage to the required level. It's unlikely something like that could be Edit: jerry(sic) jury-rigged in the field very easily, but I've done stranger things.

  • \$\begingroup\$ The phrase is "Jury Rig". \$\endgroup\$ – Majenko Nov 30 '14 at 14:46
  • \$\begingroup\$ @Majenko-notGoogle as your reference says "also jerry rigging"... an acceptable variant. Don't go all prescriptivist now. \$\endgroup\$ – Spehro Pefhany Nov 30 '14 at 14:53
  • \$\begingroup\$ "jerry rigging" is a 20th century combination of "jerry built" and "jury rigged". The two phrases have very different origins and have nothing to do with each other. It is incorrect (though "accepted") to combine them. But I guess a phrase, even an incorrect one, has to start somewhere. \$\endgroup\$ – Majenko Nov 30 '14 at 14:56
  • \$\begingroup\$ Once it's accepted it's no longer incorrect, it's just a part of English. BTW, as a former regular at alt.usage.english I was aware of the etymology of the term. \$\endgroup\$ – Spehro Pefhany Nov 30 '14 at 15:01
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    \$\begingroup\$ Religion should be pursued in some other group. \$\endgroup\$ – Russell McMahon Nov 30 '14 at 15:35

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